UT5A - All Spectrum Electronics
Contents
1. In Monostable mode the timer acts as a one shot pulse generator It has one Stable and one Unstable state The pulse begins with a negative input trigger This causes the output of the 555 timer to go from low to high starting the pulse Unstable The Pulse Width is determined by the charging network s RC time constant When the circuit times out the output of the 555 timer goes from high to low completing the pulse Stable The timer will remain in this Stable state until it is triggered again In Monostable mode the 555 timer requires an external negative pulse or spike to start its operation We will be using the pulse provided by the Input Differentiator and Limiter circuit previously described This means JMP4 Input Select must be installed JMP6 Mode Select set to pins 1 and 2 prepares the Charging Network for Monostable operation The C2 s charge path can be traced by starting at VCC down through R4 R5 to the pin7 Discharge of the timer IC through JMP6 pin1 to pin2 to C2 You may notice that R6 and R7 are bypassed in this mode C2 is also directly connected to pin6 Threshold of the timer IC When C2 is charging the Monostable is in its Unstable state C2 is allowed to charge when U1 pin3 Output is High and pin7 Discharge is providing an UTSA 7 open The Monostable mode s Stable State is defined as U1 s Output at pin3 is Low and its Discharge pin at U1 pin 7 is held at ground allowing C2 to discharge or preven2. J4 pin 1 Connect the negative lead if applicable of the load to J5 pin 1 Power Connections 1 Connect a power sources 5 to 15 volts DC positive lead to J1 pin 1 and its negative lead to J1 pin 2 2 ltis time to decide if you are going to use Timer Power or a separate power supply 3 to 24 volts DC to power the Timer Output Circuits To use Timer Power install a Shorting Block across the pins of JMP1 If you are going to use a separate supply remove the Shorting Block at JMP1 Connect your separate supplies positive lead to J1 pin 3 and the negative lead to J1 pin 2 UT5A e 23 TROUBLESHOOTING The most common reason for a hobby kit to fail is improper installation of parts Approximately 95 of the kits that come back to the factory for repair have improperly installed components even after phone or email support has recommended reviewing the kit for these problems We have thousands of examples that prove that even those with vast electronic experience can make mistakes on a simple kit So before you reach for the phone please recheck your kit for the following e Proper Parts Placement e Proper Parts Orientation e Solder Bridges e Incomplete fractured or cold solder joints any solder joint that causes you to have the slightest question should be re soldered e Proper power connection e Proper input circuit connection don t forget the ground connection For the Faults given below follow the instructions in the
3. clipped off 5 Notice how the solder joint looks close up clean and smooth with no holes or sharp points 6 Warning Use only rosin core solder or solder designed to be used with electronic equipment Use of acid core solder will void your warranty and produce a board that will disintegrate in a short period of time UTSA e 12 CORRECT AMD R For each part our word Install means a Down CJ 1 Pick the correct part type and value or part number O 2 Orient the part correctly Follow the PC board drawing or silk screen and the written directions for every part Certain types of parts must be installed with the proper leads in specific holes Things to watch for include diode bands electrolytic capacitor polarity transistor shapes dotted or notched ends of IC s and so forth O 3 Insert the part into the correct PC board location Make sure the part is mounted as close to the PC board as possible see above unless otherwise noted Most parts including lay down parts see above have holes or pads that are located inside a rectangle oval or circle Stand up resistors diodes or inductors see above with have a circle around one pad part body location with a line leading from that circle to the other pad lead only CJ 4 Solder all connections unless directed otherwise Use enough heat and solder flow for clean shiny completed connections ASSEMBLY STEPS O 1 Orient the board in the
4. high approximately 0 7VDC is applied to the base of Q3 This causes Q3 to turn on pulling its collector UT5A e 6 low approximately OVDC The Low appears at J4 pin 1 as the Non inverted Timer Output If U1 s pin3 output is High the base of Q2 is High causing it to be turned on This pulls Q2 s collector Low and this Low approximately OVDC is applied to J5 pin2 as the Inverted Timer Output If JMP7 is installed this Low approximately OVDC is applied to the base of Q3 turning it off This allows pull up resistor R12 to pull Q3 s collector High approximately V The High appears at J4 pin 1 as the Non inverted Timer Output The Inverted Timer Output at J5 pin2 and Non Inverted Timer Output at J4 pin1 can be used as logic level outputs A Low is less than 200mV and a High is from 3 to 24V depending on the supply voltage used for V They also can be used to drive a load of up to 200mA if the load is connected between V pin at J4 pin2 and either of the Timer Output pins To have the load active when the timer s output at U1 pin3 is High connect the load between J4 pin2 and J5 pin2 To have the load active when the timer s output at U1 pin3 is Low connect the load between J4 pin2 and J4 pini D3 and D4 protect Q2 and Q3 respectively from inductive kick if an inductive load is used MODES OF OPERATION Note For these explanations we will assume no Control Voltage input Only basic operation is covered here Monostabe Mode
5. order they are given This will lead you to where the problem exists All voltages given have a tolerance of 10 FAULT SOLUTIONS FAULT SOLUTIONS No output Check to make sure U1 pin 4 is ungrounded Make sure JMP1 is installed or external power is applied Make sure mode is selected with JMP6 Check U1 pin 8 for applied power Verify JMP4 is installed for Monostable mode Insure proper input is used for Monostable mode Insure JMP2 is installed for Monostable mode if required Insure good ground connections between source and timer Inverted output is only 1 Volt Remove JMP7 UTSA 24 FAULT Wrong Frequency Range in Astable mode SOLUTIONS Insure JMP4 is removed Insure JMP5 is removed and no Control Voltage is applied FAULT Unit will not start when S1 is pressed in Monostable Mode SOLUTIONS Verify JMP2 is installed Verify JMP4 is installed FAULT Output signal matches the input square wave SOLUTIONS Remove JMP3 to install the differentiator If you are still unable to solve your kit problems you may send your kit in for repair For instructions on how to return kits for repair please see the Factory Repair of Assembled Kits section of our Ramsey Kit Warranty page on the inside back cover of this manual You may also contact our Technical Support Department at Phone 585 924 4560 Email techsupport ramseyelectronics com Address Ramsey Electronics LLC Attn Hobby Kit Department 590 Fishers Sta
6. same direction as the parts layout diagram C 2 Install D1 marked 1N4148 this is identified by not only the text on the diode but also by the orange glass body with one black stripe on the end Diodes only conduct in one direction so make sure to install it cor rectly Match the black stripe on the diode to the white stripe on the cir cuit board C 3 Install D2 another 1N4148 Be sure to take the same precautions as you did with D1 C 4 Install U1 the 555 timer IC The orientation of the notched end as shown on the Parts Layout Diagram is critically important Make sure all 8 leads go through the circuit board Solder all the leads QO 5 Install C1 a 0 01uF ceramic capacitor marked 103 Ceramic capaci UTSA e 13 0000 Q 00010 aa u 00 201 tors have no polarity so they can be installed in either direction 6 Install C5 a 0 1uF ceramic capacitor marked 104 7 Install C4 another 0 01uF ceramic capacitor marked 103 8 Install C6 the last 0 01uF ceramic capacitor marked 103 9 Install Q1 the transistor marked 2N3904 this part must be mounted in a specific direction Match the shape of the transistor to the outline shown on the parts location diagram or the silkscreen on the circuit board Mount it as close to the board as possible 10 Install Q3 another 2N3904 transistor Follow the same care of instal lation as you did with Q1 11 Install Q2 the last 2N3904 transistor 12 In
7. 500K Pot C2 Pots to Minimum Maximum Maximum 0 1uF R5 7 1k R4 6 51k R4 6 501k PW 139 uS 7 1 mS 69 4 mS RT 69 uS 3 5 mS 34 7 mS TT 208 uS 10 6 uS 104 2m S FREQ 4810 Hz 94 3 Hz 9 6 Hz 0 1 uF R5 7 47k R4 6 97k R4 6 547k PW 6 5 mS 13 4 mS 75 8 mS RT 3 3 mS 6 7 mS 37 9 mS TT 9 8 mS 20 2 mS 113 7 mS FREQ 102 3 Hz 49 6 Hz 8 8 Hz UT5A 19 ASTABLE TIMING CHART FOR PROVIDED PARTS CONTINUED 50K Pot 500K Pot C2 Pots to Minimum Maximum Maximum 0 1 uF R5 7 82k R4 6 132k R4 6 z 582k PW 11 4 mS 18 3 mS 80 7 mS RT 5 7 mS 9 1 mS 40 3 mS TT 17 mS 27 4 mS 121 mS FREQ 58 70 Hz 36 4 Hz 8 3 Hz 0 1 uF R5 7 470k R4 6 520k R4 6 970k PW 65 1 mS 72 1 mS 134 4 mS RT 32 6 mS 36 mS 67 2 mS TT 97 7 mS 108 1 mS 201 7 mS FREQ 10 2 Hz 9 3 Hz 4 9 Hz 0 1 uF R5 7 1M R4 6 1 05M R4 6 1 5M PW 138 6 mS 145 5 mS 207 9 mS RT 69 3 mS 72 8 mS 104 0 mS TT 207 9 mS 218 9 mS 311 9 mS FREQ 4 8 Hz 4 6 Hz 3 2 Hz 10uF R5 7 1k R4 6 51k R4 6 501k PW 13 9 mS 706 9 mS 6 9 S RT 6 9 mS 353 4 mS 3 5S TT 20 8 mS 1 06 S 10 4 S FREQ 48 1 Hz 0 9 Hz 96 mHz 10uF R5 7 47k R4 6 97k R4 6 547k PW 651 4 mS 1 38 7 68 RT 325 7 mS 672 2 mS 3 8S TT 977 1 mS 2 0S 11 4S FREQ 1 0 Hz 496 0 mH 88 mH 10 uF R5 7 82k R4 6 132k R4 6 582k PW 1 18 1 85 8 15 RT 568 2 mS 914 8 mS 4 0S TT 1 78 2 78 12 15 FREQ 587 0 mHz 364 4 mS 83 Hz UT5A 20 ASTABLE TIMING CHART FOR PROVIDED PARTS CONTINUED 50K Pot 500K Pot C2 Pots to Minim
8. AMSEY 106 ELECTRONICS LLC 590 Fishers Station Drive ESTIMATED ASSEMBLY Victor New York 14564 TIME Phone 585 924 4560 BENET aa 3 0 hrs Fax 585 924 4555 www ramseykits com Advanced 1 0 hrs
9. CSIOnS AEO eere stats 26 Wala itii Z CA 27 RAMSEY ELECTRONICS INC 590 Fishers Station Drive JND b Victor New York 14564 Phone 585 924 4560 r arise Fax 585 924 4555 www ramseykits com UTSA 3 INTRODUCTION The UT5A is most versatile 555 timer kit on the market The input circuit op tions allow for connecting to almost any kind of digital signal The output driv ers allow for connection to digital circuits relays indictors etc It is designed to provide the easiest way to apply accurate timing signals to almost any ap plication The UTSA is also an excellent teaching tool The detailed theory of operation will arm you with the knowledge to effectively set up and use the 555 timer You will have the chance to experiment with the 555 timer IC transistor switches pull up resistors limiter and differentiator circuits In addition experienced 555 IC users will welcome the practical and truly uni versal setup of the PC board THEORY OF OPERATION Theory Intro The UT5A is made up of many small circuits used to control the 555 timer IC which is the heart of the kit First we ll cover these circuits individually then we ll place them into the two most basic modes of operation monostable and astable and analyze their operation Power Entry The UT5A requires an external 5 to 15 VDC DC power supply to operate the timer circuits This external DC supply is connected through J1 positive at pin 1 and negative G
10. IC functions Pin3 is the Output pin it will be either High near VCC or a Low near 0 VDC depending on the status of the input pins Pin7 is called Discharge it will provide ground to the charging network when the Output Pin3 is Low and an open when the Output is High Pin2 is the Trigger input When the voltage on this pin falls below the trigger level usually 1 3 VCC it will cause the Output Pin3 to go High and remove the ground from Discharge Pin7 UTSA 5 Pin6 is called the Threshold input When the voltage on this pin rises above the Threshold Level usually 2 3 VCC it cause the Output to go Low and place a ground in the charging network through the Discharge Pin7 Pin4 is the Reset When this pin goes low it will override the other inputs and force the Output to go Low and the Discharge to provide a ground to the charging network Pind is the Control Voltage This pin allows the Trigger and Threshold levels to be independent of VCC When this pin is connected the Threshold level will be equal to the Control Voltage pin J3 pin1 and the Trigger level will be 72 Control Voltage pin Reset Circuit The Reset circuit consists of R11 C6 J3 pin3 Reset Input S2 and U1 pin4 R11 is a pull up resistor that keeps the timer s RESET pin normally High C6 is a filter capacitor to ensure that noise doesn t accidently reset the timer IC S2 is a normally open push button switch that when closed pulls U3 pin4 low
11. ND at pin 2 J1 pin 3 allows for a separate 3 to 24 VDC supply to be used to set the output signal amplitude parameters or Output Power JMP1 allows the Timer Power to be used for Output Power Input Circuits Triggering the 555 timer IC requires a negative going signal applied to its input We have three ways to apply this signal to the IC 1 NEGATIVE INPUT If the source signal is negative going it can be applied to J2 pin3 the boards Input which is attached to C1 For this option JMP2 Pull up Select may or may not be installed depending on the source If installed it supplies VCC through R1 to C1 s input J2 pin3 allows us to bring a negative signal into the timer at C1 With a negative input D1 is turned off thus preventing Q1 from effecting the input signal 2 POSITIVE INPUT This option requires JMP2 the Pull up Select to be installed to provide power for Q1 The positive pulse enters through J2 pin 1 Input current limiting resistor R2 to the base of Q1 The positive signal turns on Q1 It amplifies and inverts the signal and now we have a negative going pulse passed by the steering diode D1 to C1 s input UT5A 4 3 START SWITCH INPUT We can also generate a negative signal using Start switch S1 This final option also requires JMP2 Pull Up Select to be installed Pull up resistor R1 keeps a High VCC at S1 C1 junction with no input signal applied to J2 pin3 When S1 is pressed it pulls S1 C1 junction low g
12. R4 R5 2 R6 R7 Duty cycle is the ratio of Pulse Width to Total Cycle time it can be calculated as R4 R5 R6 H7 DC R4 R5 2 R6 R7 100 UT5A o 9 UT5A PARTS LAYOUT DIAGRAM 2 ae 4Vcc GND V ocz Power O E C3 8 U W Differ Select Pull Up Select Ly cy c JTI 2ui104328 3 Kesuip3 e cz 8 CGD ve ve c Eod RESET JS UT5A 10 UT5A PARTS LIST Semiconductors g g g g UNN 4 o O00000000 Nj PO FD TV IV MN UI 200000 0000101 NA DOWN PW je g 2 ther 555 Timer IC marked 555 U1 1N4002 marked 1N4002 D3 4 1N4148 marked 1N4148 D1 2 2N3904 NPN General Purpose transistors marked 2N3904 Q1 2 3 Resistors 1k ohm resistors marked brown black red R2 5 7 9 10k ohm resistors marked brown black orange R1 3 10 11 12 47k ohm resistors marked Yellow violet orange R5A 7A 82k ohm resistors marked grey red orange R5B 7B 470k ohm resistors marked yellow violet yellow R5C 7C 1M ohm resistors marked brown black green R5D 7D 50k potentiometer orange top marked 503 R4A 6A 100k potentiometer orange top marked 104 R8 500k potentiometer orange top marked 504 R4 6 apacitors 0 01uF Ceramic disk marked 103 C1 4 6 0 01uF Ceramic disk marked 104 C5 0 1uF Mylar marked 104 CZA 10uF Electrolytic marked marked 10uF C2 3 1000uF Electrolytic marked marked 1000uF C2B onn
13. Ultimate Timer Ramsey Electronics Model UT5A We have packed the UT5A with tons of features that you won t find in any other 555 timer kit on the market You can configure it on the fly with easy to use jumper settings and drive relays plus directly interface all timer functions with onboard controls or external signals All connections are easily made through terminal blocks Timer Operates on 5 to 15 Volts DC 20mA Onboard 200mA output drivers Output drivers run on timer power or external 3 to 24 volts DC Separate Pulse Width and Rest Time controls Onboard Start and Reset switches Onboard Control Voltage Potentiometer External Start Reset and Control Voltage functions accessible through terminal blocks Onboard input pull up resistor and differentiator selectable through jumper blocks Inductive Kick protected Non inverted and Inverted outputs Pos r msey PARTIAL LIST OF AVAILABLE KITS RAMSEY TRANSMITTER KITS e FM10 FM25 FM30 FM Stereo Transmitters e FM100 FM35 Professional FM Stereo Transmitters e AM1 AM25 AM Broadcast Band Transmitters RAMSEY RECEIVER KITS e FR1 FM Broadcast Receiver e AR1 Aircraft Band Receiver e SR2 Shortwave Receiver RAMSEY HOBBY KITS e LBC6K Laser Beam Communicator e SG7 Personal Speed Radar e SS70C Speech Scrambler Descrambler TT1 Telephone Recorder LLS1 Laser Light Show MD3 Microwave Motion Detector e LEDS1 LED Strobe Light BE66 Blinky Eyes Animated Displa
14. both Pulse Width and Rest Time Control Voltage Configuration 1 For no Control Voltage remove the Shorting Block from JMP5 and leave J3 pin 1 open UT5A 22 2 Foran External Control Voltage remove the Shorting Block from JMP5 Connect an external supplies 0 to VCC positive lead to J3 pin 1 and its negative lead to J3 pin 2 3 Touse onboard Control Voltage Adjust install a shorting block across both pins of JMP5 Reset Mode 1 For External Reset connect a momentary closed switch between J3 pins 2 and 3 2 For Onboard Reset Leave J3 pin 3 open and press S2 Output Connections 1 For a digital Non inverted signal install a Shorting Block across both pins of JMP7 Connect J4 pin 1 to the load circuits signal input Connect J5 pin 1 to the load circuits ground 2 Fora digital Inverted signal remove the Shorting Block from JMP7 Connect J5 pin 2 to the load circuits signal input Connect J5 pin 1 to the load circuits ground 3 To connect a load such as a relay or lamp so that the load is energized when the output of the timer is high remove the Shorting Block from JMP7 Connect the positive lead if applicable of the load to J5 pin 2 Connect the negative lead if applicable of the load to J5 pin 1 4 To connect a load such as a relay or lamp so that the load is energized when the output of the timer is low install a Shorting Block across both pins of JMP7 Connect the positive lead if applicable of the load to
15. by each assembler and integrated into the final version of the manual which you have If you need help please read through your manual carefully all information required to properly build and test your kit is contained within the pages However customer satisfaction is our goal so in the event that you do have a problem please note the following 2 DEFECTIVE PARTS It s always easy to blame a part for a problem in your kit Before you conclude that a part may be bad thoroughly check your work Today s semiconductors and passive components have reached incredibly high reliability levels and it s sad to say that our human construction skills have not But on rare occasions a sour component can slip through All of our kit parts carry the Ramsey Electronics Warranty that they are free from defects for a full ninety 90 days from the date of purchase Defective parts will be replaced promptly at our expense If you suspect any part to be defective please mail it to our factory for testing and replacement Please send only the defective parts not the entire kit The part s MUST be returned to us in suitable condition for testing Please be aware that testing can usually determine if the part was truly defective or damaged by assembly or usage Don t be afraid of telling us that you damaged it or burned it out we re all human and in most cases replacement parts are very reasonably priced Remember our goal for over three decades is to have a happ
16. d and tested product together with your proof of purchase to the factory for a full refund less shipping The return package should be packed securely Insurance and tracking is highly recommended A reminder this applies to unassembled kits They must be in the same new condition as received not partially assembled Assembled kits cannot be returned for credit No RMA s are required simply return to Ramsey Electronics LLC Attn Product Returns 590 Fishers Station Drive Victor NY 14564 If you have any questions please contact us at 585 924 4560 5 FACTORY REPAIR OF ASSEMBLED KITS Most of us at Ramsey are technically oriented and we do realize that things happen Even following the best practices with all of the best intentions there is that chance that your kit doesn t work when you have completed it Each manual goes into detailed troubleshooting based on the specific kit to help you troubleshoot the problem We have found that 9596 of returned kits involved wrongly installed components wrong part or backwards polarity This section of the warranty assumes you have gone through all those steps and have now reached the point that you need to send it back To qualify for factory repair of customer assembled kits the following conditions apply Kits must not be assembled with acid solder flux Kit boards or circuits must not be modified in any manner from the version received Kits must be fully assembled not partially assembled Our wa
17. ectors Two terminal terminal block J4 5 Three terminal terminal block J1 2 3 2 pin header H1 2 3 4 5 7 3 pin header H6 Jumper Blocks SPST Push Button switch S1 2 O 1 Circuit Board UTSA 11 RAMSEY LEARN AS YOU BUILD ASSEMBLY STRATEGY Be sure to completely read through all of the steps and check the boxes as you go to be sure you didn t miss any important assembly instructions Although you may be in a hurry to see results before you switch on the power check all wiring and capacitors for proper orientation Also check the board for any possible solder shorts and or cold solder joints Any of these mistakes could have detrimental effects on your kit not to mention your ego Kit building tips Use a good soldering technique let your soldering iron tip gently heat the traces to which you are soldering heating both leads and pads simultaneously Apply the solder to the iron and the pad when the pad is hot enough to melt the solder The finished joint should look like a drop of water on paper somewhat soaked in Mount all electrical parts on the topside of the PC board This is the side that has few or no traces on it the side with the silkscreen writing When parts are installed the part is placed flat to the board and the leads are bent on the backside of the board to prevent the part falling out before soldering 1 The part is then soldered securely to the board 2 4 and the remaining lead length is then
18. iving us a negative pulse at C1 s input Differentiator Circuit and Limiter If the input pulse has a long negative duration it can override the 555 timer s output In most cases this is not desirable however if it is then you can install JMP3 Differentiator Select When JMP3 is not installed C1 and R3 act as a differentiator circuit This circuit will turn an input square wave or long duration pulse into a negative and positive short duration pulse Pulse width is determined by C1 s charge or discharge path Since R3 is tied to VCC the junction of C1 R3 will rest at VCC The short duration pulses will be imposed on that DC level The negative short duration pulse will have an amplitude slightly less than the original pulse The positive short duration pulse will have its amplitude limited by D2 to a maximum of VCC 0 7V This is to prevent false operation of the timer IC JMP2 Input Select must be installed for any circuit requiring an external trigger input Charging Network R4 R5 R6 R7 and C2 make up the RC network responsible for all timing in the UT5A The component values determine the rate at which the capacitor C2 charges and discharges JMP6 controls the way the charging network is connected to the timer IC JMP6 also determines the mode of operation which we will discuss later Timer Pin out and Function The 555 timer IC has 8 pins Pin1 provides Ground to all timer functions Pin8 is VCC and provides power for all
19. on one end It is a stand up diode Bend the lead closest to the stripe over so that it comes back across the diode and is in parallel with the other lead Match this stripe end lead to the circuit board pad closest to the white stripe on the board s silkscreen The lead attached to the black body goes through the hole with the silk Screen circle 30 Install D3 another 1N4002 diode marked 1N4002 Install this diode in the same manor as D4 31 Install C3 a 10uF electrolytic capacitor marked 10uF Electrolytic capacitors have a right and wrong way to be installed Usually these ca pacitors have a wide stripe which indicates their polarity Most of the time this stripe indicates the negative lead This can be verified by looking for the sign in the stripe On rare occasions this stripe with have a sign indicating a positive polarity The PC board or Parts Layout Diagram will show the positive side of the capacitor s installation hole Be sure to place the capacitor lead into the PC board hole and the lead into the hole Observe correct polarity when installing all electrolytic ca pacitors 32 Install J2 a three terminal terminal block The wire openings must face outboard Make sure the terminal block is square and flush to the circuit board 33 Install J1 another three terminal terminal block Install it with the same precautions you did J2 34 Install J4 a three terminal terminal block 35 In
20. rcuit to J2 pin 2 If the input signal is a square wave or a wide pulse you can select which edge of the waveform you wish the timer to trigger If you wish to trigger on the positive going transition connect to pin 1 if the negative going transition connect to pin 3 4 Your input circuit may need a pull up resistor If the source circuit provides both a high and low the pull up will not be needed so remove the Shorting Block from JMP2 If the input circuit provides a contact closure or open closed path for current then you will need the pull up resistor Place a Shorting Block on the pins of JMP2 5 If the input signal is a square wave or wide duration pulse you will probably need the signal to be differentiated This prevent the input signal from interfering with the timing of the timer Remove the Shorting Block from the pins of JMP3 to activate the differentiator circuit If it is required that the differentiator be disabled install a Shorting Block across JMP3 s pins This Shorting Block will normally not be installed 6 Verify that R4 R5 and C2 are the proper values to give the timing you require Astable Mode 1 Install a Shorting block across pins 2 amp 3 of JMP6 2 Typically a in the Astable mode an input is not required Remove the Shorting Block from JMP4 This removes R3 and R1 from C2 s charge path with JMP6 jumped pins 2 to 3 3 Verify that R4 R5 R6 R7 and C2 are the proper values to give the timing you require for
21. resetting the timer IC J3 allows for an external reset of the timer IC Control Voltage Circuit The control voltage circuit is used to change the trigger levels of the timer as mentioned in Timer Pin out and Function It also can be used for pulse width and pulse position modulation C4 is a filter capacitor that ensures noise does not effect timer operation R8 allows the Control Voltage to be set to any value between 0 and VCC JMP5 allows R8 s wiper voltage to be applied to the timer IC J3 pint allows for an external Control Voltage This voltage can be any voltage up to VCC AC or DC JMP5 should not be installed if an external Control Voltage is being used With JMP5 removed and no input on J3 pint the 555 timers Trigger and Threshold voltages are at their default 1 3 VCC and 2 3 VCC values respectively Timer Output Circuits The Inverted Timer Output circuit consists of current limiting resistor R9 pull up resistor R10 protection diode D3 and transistor Q2 The Non inverted Timer Output consists of JMP7 the Non Invert jumper R12 pull up resistor protection diode D4 and transistor Q3 The output of the timer chip U1 pin3 is connected to Q2 through current limiting resistor R9 If U1 s pin3 output is Low the base of Q2 is Low which turns it off This allows pull up resistor R10 to pull Q2 s collector High If JMP7 is removed this High approximately V is applied to J5 pin2 as the Inverted Timer Output If JMP7 is installed this
22. rmined by the discharge time of the Charging Network In Astable mode JMP4 Input Select is removed disconnecting the signal inputs JMP6 is set connecting pin2 and pin3 This sets up C2 charge and discharge path and connect both U1 pin2 and pin6 to C2 Since this mode is free running no input other than applying power is needed to start the circuit Lets start at the end of rest time with U1 pin3 Output Low U1 pin7 Discharge grounded and C2 discharging slowly When the charge on C2 decreases below the Trigger level 1 3VCC or 1 2 control voltage if used U1 pin2 Trigger input causes the start of Pulse Width by setting U1 pin3 Out to go High and Discharge pin7 removes ground C2 is now allowed to charge through R7 R6 R5 R4 to VCC When C2 s charge reaches Threshold level 2 3 VCC or Control Voltage if used U1 pin6 Threshold ends UT5A e 8 Pulse Width and begins Rest Time by setting Out to Low and grounding Discharge C2 now discharges through R7 R6 U1 pin7 to ground in the 555 timer back to C2 When C2 reaches Trigger level Rest Time comes to an end and we begin the process over again Formulas for calculating Pulse Width PW and Rest Time RT follow assuming no control Voltage used PW 0 693 C2 R4 R5 R6 R7 RT 0 693 C2 R6 R7 Total Time T can be calculated as T PW RT Or T 0 693 C2 R4 R5 2 R6 R7 Frequency f can be calculated as 1 af a a f T 0 693 C2
23. rranty does not include finishing your kit Must include a full description of the problem encountered including the troubleshooting steps you have already done Must not include non standard non Ramsey accessories cases enclosures knobs etc or any batteries Must include the minimum repair fee of 25 USD in the form of check money order or credit card authorization Ramsey Electronics LLC reserves the right to refuse any repair due to excessive errors in construction methods If due to customer construction methods the repair is estimated to exceed the minimum flat rate Ramsey Electronics LLC will contact the customer to discuss the repairs needed and to receive authorization and payment for repair prior to repair In the unlikely case that a defective part is found to be the cause of the problem the repairs will be made at no charge to the customer and any payments received for repair will be returned or credited back to the customer Properly pack your kit insure the package and use a carrier that can be tracked Ramsey Electronics LLC is not responsible for any loss or damage in shipment Send the package together with your repair fee to the return address below No RMA is required 6 FACTORY REPAIR FEES Please understand that our Tech Support Group personnel are not volunteers They are a dedicated group of highly trained technicians each configured with a very properly equipped test bench Upon receipt of a repair the setup tes
24. stall J5 a three terminal terminal block 36 Install J3 the last three terminal terminal block You will probably notice five parts are still missing from your board and you have more than five parts left A this point you will need to figure out what part values you need to install for your first application See the the ory of operation section for calculations or the charts that follow at the end of this section for a component values UT5A 17 Two different values potentiometers are provided to allow for better tuning of your timer The 50k pot allows for fine tuning when more precise pulse widths are required The 500k pot allows for greater time ranges The Monostable Pulse Width chart shows the Pulse Widths available with provided components The R4 Minimum column shows the minimum 0 ohms Pulse Width for both provided potentiometers 50K and 500K and the capacitor resistor combination shown in the left most column The R4 50k R4 Maximum column shows the maximum Pulse Width of the 50k pot and the resistor capacitor combination shown in the left most column The R4 500k R4 Maximum column does the same for R4 500k The Astable Timing Chart works the same way as the Monostable Pulse Width chart in addition to Pulse Width it also provides Rest Time Total Time and Frequency This chart it assumes that R4 R6 and R5 R7 which is not required You may mix and match the potentiometers and resistors as you wish 37 In
25. stall R1 a 10k ohm resistor marked brown black orange Resis tors are like ceramic capacitors they have no polarity They can be in stalled in either direction All resistors in this kit are stand up resistors The pad with the silkscreen circle is the pad that the body of the part sits on 13 Install R3 another 10k ohm resistor marked brown black orange 14 Install R12 yet another 10k ohm resistor marked brown black orange 15 Install R10 still another 10k ohm resistor marked brown black orange 16 Install R9 a 1k ohm resistor marked brown black red 17 Install R11 the last 10k ohm resistor marked brown black orange 18 Install R2 a 1k ohm resistor marked brown black red 19 Install R8 a 100k ohm variable resistor marked 104 This part has three legs and will only fit easily in one direction 20 Install 51 a SPST Push Button switch This part will fit in the board in two different directions either one will work 21 Install S2 an other SPST Push Button switch 22 Install JMP2 a 2 pin header 23 Install JMP3 another2 pin header 24 Install JMP4 another2 pin header UT5A 16 000010 25 Install JMP1 another2 pin header 26 Install JMP7 you guessed it another 2 pin header 27 Install JMP6 a 3 pin header 28 Install JMP5 finally the last 2 pin header 28 Install D4 this diode is marked 1N4002 This part has a black body with one silver or white stripe
26. stall R4 either the 50k marked 503 or 500k marked 504 potenti ometer Make sure this part is square and flush to the board 38 Install R6 the other timing potentiometer either the 50k marked 503 or 500k marked 504 39 Install R5 using the calculations or charts select your part value Used the parts list description of color bands Example 1K marked brown black red to select the proper resistor 40 Install R7 for this part follow the instructions for R5 above 41 Install C2 using the calculations or charts select your part value If you select the 0 1uF capacitor marked 104 polarity is no concern If you select the 10uF marked 10uF or the 1000uF marked 1000uF electro lytic capacitor observe correct polarity UT5A 18 MONOSTABLE PULSE WIDTH CHART FOR PROVIDED PARTS R4z50k Pot R 4 500k Pot R4 Minimum R4 Maximum R4 Maximum C2 0 1uF R4 1k 110 uS 5 6 mS 55 1mS R4 47k 5 2mS 10 7 mS 60 2 mS R4 82k 9 mS 14 5 mS 64 mS R4 470k 51 7 mS 106 7 mS 106 7mS R4 1M 110 mS 115 5 mS 165mS C2 z 10uF R4 1k 11 mS 561 mS 5 55 R4 47k 517 mS 1 18 6S R4 82k 902 mS 1 58 6 4S R4 470k 5 28 5 72S 10 7S R4 1M 11S 11 65 16 5 S C2 1000uF R4 1k 115 56 1 S 551 15 9 2M R4 47k 51 78 106 7S 1 8M 6028 10M R4 82k 90 2 S 1 5M 145 28 2 4M 640S 10 7M R4 470k 517S 8 6M 572S 9 5M 10678 17 8M R4 1M 11008 18 3M 1155S 19 3M 16508 27 5M ASTABLE TIMING CHART FOR PROVIDED PARTS 50K Pot
27. ting diagnosis repair paperwork and repacking of your kit requires nearly an hour of their time regardless of the size or complexity of the kit The minimum repair fee represents 1 2 hour Tech Support time at 50 hour USD We try to keep all kit repairs within the realm of the 25 flat rate whenever possible and trust us we exceed that time spent on most kits received more often than not 7 CONTACT INFORMATION AND RETURN ADDRESS Technical Questions Product Repair amp Returns RAMSEY ELECTRONICS LLC RAMSEY ELECTRONICS LLC Attn Tech Support Attn Repairs 590 Fishers Station Drive 590 Fishers Station Drive Victor NY 14564 Victor NY 14564 585 924 4560 585 924 4886 Fax 585 924 4560 585 924 4886 Fax techsupport ramseyelectronics com repairsQ ramseyelectronics com Quick Reference Kroneto ZD a ac cec 4 Theory of Operation 4 Parts Layout Diagram 10 Parts List acus 11 Assembly Stebs ooi 13 Schematic Diagram 14 Vo p 22 Specifications 2 1111222 112 26 REQUIRED TOOLS Soldering Iron Thin Rosin Core Solder Needle Nose Pliers Small Diagonal Cutters ADDITIONAL SUGGESTED ITEMS e Helping Hands Holder for PC Board Parts e Desoldering Braid Manual Price Only 5 00 amsey Publication No MUT5A Assembly and Instruction manual for RAMSEY MODEL NO UT5A Ultimate Timer gt on ramsey TOTAL SOLDER POINTS R
28. ting it from charging The timer will stay in this mode until properly triggered The discharge path will be from C2 through JMP6 pin2 to pin 1 U1 pin7 to ground through the 555 timer IC back to C2 When the proper trigger appears at U1 pin2 Trigger input the Output at pin3 goes High and the ground at pin7 is removed unstable state This allows C2 to start to charge through JMP6 pins 1 to 2 R5 and R4 to VCC When the charge on C2 reaches the Threshold level 2 3 VCC or Control Voltage if used U1 pin6 Threshold will cause the 555 timer to change to the stable state setting the Output pin pin3 to a Low and applying ground at the Discharge pin pin7 The Discharge pin pin7 being at ground discharges C2 The time C2 charges in the Unstable state is the Pulse Width PW of the signal it can be calculated with the following formula C2 s discharge path has no resistance so it is considered to be instantaneous It is important to note that the use of a control voltage will change the Threshold level of the IC therefore change the RC timing and the pulse width PW 1 1 C2 R4 R5 Astable Mode In the Astable no stable states mode the timer is free running and acts like a square wave generator We will call the High output of the square wave from the 555 timer Pulse Width PW and the Low portion of the square wave Rest Time RT The Pulse width is determined by the RC charge time of the Charging Network and Rest Time is dete
29. tion Drive Victor NY 14564 UT5A e 25 UT5A SPECIFICATIONS Input Requirements Timer Power 5 to 15 VDC Output Circuit Power 3 to 24 VDC or Timer Power Modes of Operation Monostable Most Pulse Widths from 110uS to 27 5 Minutes with included parts Astable Most Time Cycles from 210uS to 57 Minutes with included parts Maximum Load 200mA Inductive kick protected Dimensions 2 5in W X 2 5in L X 1 0 H 63 5mm W X 63 5mm L X 25 4mm H Weight 1 1 Oz 0 0312 Kg CONCLUSION We sincerely hope that you will enjoy the use of this Ramsey product As always we have tried to compose our manual in the easiest most user friendly format possible We value your opinions comments and suggestions on what you would like to see in future publications Please submit comments or ideas to Ramsey Electronics LLC Attn Hobby Kit Department 590 Fishers Station Drive Victor NY 14564 or email us at techsupport ramseyelectronics com And once again thanks from the folks at Ramsey UT5A 26 THE RAMSEY KIT WARRANTY 1 GENERAL Notice that this is not a fine print warranty We want you to understand your rights and ours too All Ramsey kits will work if assembled properly The very fact that your kit includes this new manual is your assurance that prior to release of this kit a varied group of knowledgeable people have assembled this kit from scratch using this manual During this process changes and additions are noted
30. um Maximum Maximum 10uF R5 7 470k R4 6 520k R4 6 970k PW 6 5 S 7 28 13 4S RT 3 3 S 3 6 5 6 78 TT 9 8 S 10 8 S 20 2 S 10 uF R5 7 1M R4 6 1 05M R4 6 1 5M PW 13 9 5 14 6 8 20 8 S RT 6 9 S 7 38 10 4 S TT 20 8 S 21 88 31 28 1000uF R5 7 1k R4 6 51k R4 6 501k PW 1 48 70 7 S 694 4 11 6 M RT 693 mS 35 3 S 347 2 S 5 8M TT 248 106 S 1041 6 S 17 4 M 1000uF R5 7 47k R4 6 97k R4 6 547k PW 65 1S 1M 134 48 2 2M 758 1 S 13 6 M RT 32 68 54M 67 28 1 1M 379 1 S 6 3 M TT 97 78 1 6M 201 7S 3 4M 1137 2S 19 0M 1000uF R5 7 82k R4 6 132k R4 6 z 582k PW 113 7S 1 9M 183 S 3 1M 806 7 S 13 4 M RT 56 88 1 0M 91 58 1 5M 403 3 S 6 7 M TT 170 5S 2 8M 274 4S 4 6M 1210 0 S 20 2 M 1000uF R5 7 470k R4 6 520k R4 6 970k PW 651 48 10 9M 720 78 12 0M 1344 4 S 22 4 M RT 325 7S 5 4M 360 6S 6 0M 67228 11 2M TT 977 1 8 16 3M 1081 1 S 18 0 M 2016 6 S 33 6 M 1000uF R5 7 1M R4 6 1 05M R4 6 1 5M PW1386 08 23 1 M 1455 3 S 24 8 M 2079 08 34 7 M RT693 05 11 6M 727 78 12 44M 1039 5 S 17 3 M TT20798 34 7M 2183 0 S 36 4M 3118 5 5 52 M UT5A 21 SETUP Monostable Mode I I I 1 Install a Shorting Block across pins 1 amp 2 of JMP6 2 Inthe Monostable mode the timer needs an input Install a Shorting Block across both pins of JMP4 3 Connect the source circuit to J2 Connect the input to J2 pin 1 if the signal is a positive going pulse or pin 3 if itis a negative going pulse Connect the ground of the source ci
31. y e LTS1 Laser Trip Sensor e ICI1C Infrared Switch Control Interface RAMSEY AMATEUR RADIO KITS HR Series HF All Mode Receivers e DDF1 Doppler Direction Finder Kit e QRP Series HF CW Transmitters and QAMP Power Amplifiers CW7 CW Keyer RAMSEY MINI KITS Many other kits are available for hobby school scouts and just plain FUN New kits are always under development Write or call for our free Ramsey catalog UTSA Universal Timer Ramsey Electronics publication No UT5A Rev 1 3a First Printing February 2010 This Printing August 2010 COPYRIGHT 2010 by Ramsey Electronics Inc 590 Fishers Station Drive Victor New York 14564 All rights reserved No portion of this publication may be copied or duplicated without the written permission of Ramsey Electronics Inc Printed in the United States of America UTSA 2 Ramsey Publication No SHA2 Manual Price Only 5 00 INSTRUCTION MANUAL AND ASSEMBLY STEPS FOR UT5A UNIVERSAL TIMER TABLE OF CONTENTS Introduction 22 pa ecce 4 Theory of Operation 4 Parts Layout Diagram 10 PZD unn andi uter tir 11 Learn as you Build 12 Assembly Steps 13 Schematic Diagram 14 Monostable Pulse Width Chart 19 Astable Timing Chart 19 Siet s A EEEE EEPE ENSE 22 Troubleshooting err 24 SDEDII
32. y customer and we re here to work WITH you not AGAINST you 3 MISSING PARTS Before assuming a part value is missing check the parts listing carefully to see if it is a critical value such as a specific coil or IC or whether a RANGE of values is suitable for the component such as a 100 to 500 uF capacitor Often times common sense will solve a mysterious missing part problem If you re missing five 10K ohm resistors and received five extra 1K resistors you can pretty much be assured that the 1K ohm resistors are actually the missing 10 K parts Hum m m guess the orange band really does look red Ramsey Electronics project kits are packed with pride in the USA by our own staff personnel While separate QC checks are made on all product kits we too are human and once in a great while there is a chance something can get through those checks If you believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual for your Ramsey kit please contact us with information on the part you need Contact our Repair Department via telephone email or writing Please have your invoice number and date of purchase handy 4 REFUNDS All Ramsey products kit or factory assembled units have an unconditional 10 day from the date of purchase return policy to examine our products If you are not satisfied for any reason you may return your unassembled kit with all the parts and instructions or your factory assemble
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